Three-Dimensional Finite Element Analysis of a Simplified Compression Plate Fixation System

[+] Author and Article Information
E. J. Cheal, W. C. Hayes, A. A. White

Orthopaedic Biomechanics Laboratory, Department of Orthopaedic Surgery, Charles A. Dana Research Institute, Beth Israel Hospital and Harvard Medical School, Boston, Mass. 02215

S. M. Perren

Laboratorium fur Experimentelle Chirurgie, Schweizerisches Forschungsinstitut, Davos, Switzerland

J Biomech Eng 106(4), 295-301 (Nov 01, 1984) (7 pages) doi:10.1115/1.3138497 History: Received March 21, 1983; Revised March 27, 1984; Online June 15, 2009


A three-dimensional, linear finite element model was generated for an intact plexiglass tube with an attached six-hole stainless steel compression plate. We examined external forces representing axial, off-center axial, and four-point bending, along with superimposed plate and screw pretension. Strain gage experiments were conducted to test model validity and the finite element results were contrasted to a composite beam theory solution. Excellent correspondence was observed between finite element and strain gage data for the most significant strain components. Composite beam theory tended to overestimate the neutral axis shift which results from plate application. The model also demonstrated fracture site distraction due to plate pretension, and the tendency for outer screw failure for the combination of bending-closed with a preload in the plate and screws.

Copyright © 1984 by ASME
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